SAP WM vs EWM

SAP WM is now a part of SAP Logistics execution module and has undergone several releases from the first time it was introduced by SAP as a independant warehouse solution in the R/2 environment. From 2006 we see it in its most developed form as a part of LES which is available as release ECC 6.0 .
SAP eWM is similar to SAP WM functionality but with more flexibility in customising like the warehouse structure or picking/put away processes. Also new concepts like activity areas, Work Centers, and Resources are incorporated into SAP EWM .
As per SAP , eWM is not projected as a replacement to WM but more as a robust and flexible alternative to WM .

From what I could understand ,here I will compare both the solutions in terms of their functionalites that are available in the versions ECC 6.0 for WM and EWM 7.0 for eWM

From System documents perspective :

WM has Transfer requests and Transfer orders .Transfer orders are the actual work orders based on which the stock movement takes place withing a warehouse .

eWM has a slightly different presentation of these documents .eWM has Warehouse order which is similar to a WM Transfer order and further a Warehouse task which is similar to Transfer order line item.

In WM movement types that determine the shipment type in Transfer order .
In eWM there is a concept of warehouse process type which determines warehouse task creation with reference to reference document types

In WM printing is controlled by setting up configuration that is primarily based on movement type .
In eWM there is new concept called post processing framework.It has a condition table concept with action profiles.

From Architecture perspective:

SAP WM is primarily designed as a central warehouse which is a component of Logistics execution in the same ERP system and integrates with other logistics modules .

SAP eWM system is designed to run as a Decentralized system.Although it can be deployed in the ERP system it is more commonly considered as an application in the SCM server landscape.

From processes / functionality perspective: Given below the comparision in Yes /No format for the various functionalities offered in SAP ewM .For a similar functionality not available in SAP WM I have mentioned as No .

	eWM	WM	Comments
INBOUND PROCESSING
Receive ASN data	Yes	No
ASN Validation & Correction	Yes	No
Transporation Unit Arrival	Yes	No
Manage Transportation Unit	Yes	No
Goods Receipt	Yes	Yes
Putaway Bin determination	Yes	Yes
Unload Transportation Unit	Yes	No
Internal Routing	Yes	No
Slotting	Yes	No
Deconsolidation	Yes	No
Putaway	Yes	Yes
Returns / Reverse Logistics	Yes	No
Goods receipts optimization	Yes	No

INHOUSE PROCESSESING	eWM	WM	Comments
Rearrangement	Yes	No
Inventory Counts / Record Accuracy	Yes	Yes	eWM:inventory based on products and/or based on storage bins.New feature physical inventory during putaway
Replenishment	Yes	Yes
Freight Order Management	Yes	No
Kit to Stock	Yes	No

OUTBOUND PROCESSING	eWM	WM	Comments
Route Determination	Yes	No
Wave Management	Yes	Yes
Picking Bin Determination	Yes	Yes
Warehouse Order Creation	Yes	Yes	EWM =Warehouse order / WM = Transfer order
Work Assignment	Yes	Yes
Picking	Yes	Yes
Packing	Yes	Yes
Staging	Yes	Yes
Goods Issue	Yes	Yes
Kit-to order	Yes	Yes
Prodution Supply	Yes	Yes

CROSS PROCESSES	eWM	WM	Comments
Transportation Cross Docking	Yes	Yes

Yard Management	Yes	Yes
Labour Management	Yes	No	SAP WM has TRM
Opportunistic Cross Docking	Yes	Yes

SUPPORTING PROCESSES	eWM	WM	Comments
EH&S Integration	Yes	No
RF support for processes	Yes	Yes
Batch Management	Yes	Yes
Material Flow System	Yes	No
Warehouse cockpit	Yes	No
Goods Receipt – Optimization	Yes	No